World Series television ratings

Audience measurement by Nielsen Media Research, commonly referred to as Nielsen ratings, has provided World Series television ratings since at least 1963. Key measurements are ratings, the percentage of all U.S. television-equipped households that watched a game, share, the percentage of television sets in use that were tuned to a game, and total viewers (or viewership), the average number of people watching a game throughout its duration.

Source: Wikipedia — World Series television ratings (CC BY-SA 4.0)